AdapterFactoryTreeIterator


1   /**
2    * <copyright> 
3    *
4    * Copyright (c) 2002-2004 IBM Corporation and others.
5    * All rights reserved.   This program and the accompanying materials
6    * are made available under the terms of the Eclipse Public License v1.0
7    * which accompanies this distribution, and is available at
8    * http://www.eclipse.org/legal/epl-v10.html
9    * 
10   * Contributors: 
11   *   IBM - Initial API and implementation
12   *
13   * </copyright>
14   *
15   * $Id: AdapterFactoryTreeIterator.java,v 1.2 2005/06/08 06:17:05 nickb Exp $
16   */
17  package org.eclipse.emf.edit.provider;
18  
19  
20  import java.util.Collections  ;
21  import java.util.Iterator  ;
22  
23  import org.eclipse.emf.common.notify.AdapterFactory;
24  import org.eclipse.emf.common.util.AbstractTreeIterator;
25  
26  
27  /**
28   * This implements a tree iterator that iterates over an object, it's children, their children, and so on,
29   * use the {@link ITreeItemContentProvider}s produced by an adapter factory.
30   */
31  public class AdapterFactoryTreeIterator extends AbstractTreeIterator
32  {
33    /**
34     * This keeps track of the factory used to generate the ITreeItemContentProvider adapters.
35     */
36    protected AdapterFactory adapterFactory;
37  
38    /**
39     * This constructs tree iterator that iterates over an object, it's children, their children, and so on.
40     */
41    public AdapterFactoryTreeIterator(AdapterFactory adapterFactory, Object   object)
42    {
43      super(object);
44      this.adapterFactory = adapterFactory;
45    }
46  
47    /**
48     * This constructs tree iterator that iterates over an object (but only if includeRoot is true), 
49     * it's children, their children, and so on.
50     */
51    public AdapterFactoryTreeIterator(AdapterFactory adapterFactory, Object   object, boolean includeRoot)
52    {
53      super(object, includeRoot);
54      this.adapterFactory = adapterFactory;
55    }
56  
57    protected Iterator   getChildren(Object   o)
58    {
59      ITreeItemContentProvider treeItemContentProvider = (ITreeItemContentProvider)adapterFactory.adapt(o, ITreeItemContentProvider.class);
60      return
61        treeItemContentProvider != null ?
62          treeItemContentProvider.getChildren(o).iterator() :
63          Collections.EMPTY_LIST.iterator();
64    }
65  }
66
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